Wireless picture transmission



April 7, 1931. v. K. zwoRYKlN WIRELESS PICTURE TRANSMISSION Filed May 10, 1929 2 Sheets-Sheet 1 ATTORNEY April 7, l931- v. K. zwoYKlN 1,800,000

WIRELESS PICTURE TRANSMI'SSIION Filed May l0, 1929 2 Sheets-Sheet 2 ATTORNEY `??trensleetttingsystem-` 0 l 0 e c Y ln my fccpend'nglt-applicaticn, Serial No,`

Patented Apr. 7,1931

PENNSYLVANIA, sereno-E TQWESTLNG;

A u1ermee STATES PATENT ori-'lcs l ymlmmnx. ZWOEMEIN, `0E sWrssVAEE,

" fHcUsE ELECTRIC "MANUFACTUEINNG COMPANY, n conrortnmoNcE fPEENsYLL u wmELEss PICTURE `flllNltllfS,SION

Application 0112010120570"10,1929.` Seria; me` s019900.

d 1,4 M,wentenreletes to facsimile-transmit? tingqrecevng @systems end it` has ,pautcular reletgn gto `systems `of `'the `,type `wherein` `the peturesoemesseges to be transmitted ere oe e5 en epequefstwfece. l 0 0 0 f .l lft. .thas hetetoetore been `Proposed to `mount e `zpictelzreto loe 1f transmitted upon 1` e ,cylinder enel to freeroducefet the receiving stetiou, the metete unen; e sheet. eff light-sensitive -mef j lll terialli meunted upon e similar eylcslee Means for causingthe `two cylindersltc rebate in syeechfeorelsnc` encens" for verwees i `the l `light,ettheeecevtngstation,in accordance 0 wich the; `lelzght'ltess oi `:theseverel "points in" le the picture-being transmitted, lleve been-else:

t pveposed *The `proposetls heretofore lleve howevers been` llmteclto transmitting teensizluceet pictures," stitches photographic llms,

documents end thellike .have neeesserily,

gcephs `developed;loe-fere suchpioteres or document couldl beutlzed in e fecsimlesages or @nctureeepon lopeqlle .surfaces` may prevemengt over `.the inventolc` disclosed Ete 3?1 my concedingeppleetonr end has, es `ceci of its objects, `ce proyde@5fecsiInile-transmite,l

fteg-lteoetiesseystem `whelceloy e plurality of Pictures or @messeees` eeontepeece seffecesi:

p 1 maybe transmitted `without interrupting the devicewiblrnewmetter l(0r-1,stoppingcheres,"

e respectfte `theexs `ef` cetetec theceefthet each `element;of the runeses; e or 1picture, sin its ceugi'ng, apparatus cto lplce additional lig Y ,Another ,object 4:of my invention is 4:0`

4? ,1 Yicle e,1fecsimleetrensrctteereceiving sue t tem V,that shell be substentelly `uneleetetllut `disturbances,` such `as static 4end-the like.

to` betreesmtted te fpeestheough the rpeth of e eoeteueeslysmetiegeey ef Flight. "Gllhe conveyor device is `so `disposed thadqat l:tghe trecsmittieg eetl, thepicteee is caused to es sume e Semifeylleelrieel 0contour` andes `si-` multeeeoeslyedeeneedtotheelieeeeioe effe-the of the picture is subjected thenetp @s it ud-` Vances.` 0 l f Reflected lie-lit the lnctele` er sage is caused to fall upon a photo-electric cell, `the output -f-rem which J@is utlizedwto l modeletee ,sedie wtreeemitter; er Ve cernier-` eertent,` tlfecsmlttet; en ,the meneer well knowelteftllose skilled inf `the ert, or es die t closed in myc-conceding gepelioetien.

At the receivingfend, e Ecentinn,ousyvstmp ,cf light-sensitive ieleterel his to `ie,ssurslle esemieylindrceleenteeteeitpessesfthrcueh the rethltreetllbye Deering rey et llghttfrem l light imm :the glesw telcel isecesed to lretete 1 amend the lexis 0o-1t` l `the cylinder endfehus treeesefseriesef eontineousilincs cnthe tliehtl sensmeestclp, eeeh lieeebetngseperetedrem t t t lts Ptedeeessertw` en emoentflerepereenel atc theengeler weloctlyef :the `tfeyeml elle speed t of advance of the said strip, 'llhe intensity ofthe glow emp ismocleleted bysthe inccml legi seeelllreptesectetiee qfthe tsensmetted plctutewce meneer @Well eknewn to these l e lne 1ceder tllett` stete eed stflcile` ldisterllf ences zshell nel' :eduetseluf eeetltheftecns-J mission ef elle ,ciotuees, l1 may .elso se erl e range the transmitting periggnpf the system l thet the `Pictureoeleleesege :1s sebeeted tto two or `innere "retelling ters et` tight trom te fixed eelree;,thereysebengse fllseeseldf-wieh t t Ineens; `est `:which.two or lmore fretetingxneys 0 from tllefeeeeiwieg "glew cube eeeeeueed ,te t c fall upon` each separate element of thel lightsensitive strip during its advance.

. ization and its method of operation, together with additional objects and advantages there'- drawings, in which transmitting device comprising a preferred.

of,A will -bestloe understood from therfollowing description of aspecipic embodiment when ready in connection with the accompanying Figure 1 isa top plan view ofi-.facsimileembodiment of my invention.

\ Fig. 2 is a vertical .sectional viewof the apparatus, taken' along'a line corresponding to the line II-II ofFig. 1.

- nFig. 3 isan end elevational vievv'of the apparatus, looking toward the left.

Fig. 4 is an end elevational view vtion of a receivingy device.

Fig. 5 is av vertical sectionalview, taken along a line corresponding to the lineVY ofFig. 4; and Y Fig. 6 is a'vertical sectionalview olf-'an alternative-form `of transmitting scanning device. f'

V` The apparatusillustrated in Figs. 1 and 2-comprisesv a housing 1' wherein is disposed a -rotatingscann'ing device hereinafter'to be described indetail, 'a' housing V2l adapted to containa photo-electric cell 3 and a housing L4v adapted to'contain la light source 5.

,A Means, comprising aplurality of vendless cords', are'providedf'or conveying a'picture to be transmitted past the vrotating scanning device, each of the'said cords'exten'dingbef tween al pluralityof pulleys 7 and 8. The motive power for; the cord-conveyor is sup; plied bya motori() connected, by appropriate gearing, to a'vertica'l spindle Y11 on which'the. pulleys 8 are mounted. Motivepower forV the scanning device is provided by a separate electric inotor 12j i l Y i' will be more vclearly seen from anf'inspection of Fig. 2. The'said device comprises ya holf i. low shaft 13 rotatably supportedin appropriate Ahearings l14 and having a pinion '15 mountedthereon'. The'pinion is operatively connected to a wormwheel'nl mounted'upon theshaftof thejmotor12.' i

.a1-plurality of iense's'- 17 are' many die; posed withi'nithe hollowjshaftfl 'and serve to f'z'oncentratel li'ghtvfrom the" source y5, con-l tained within the housing 4, upon'a plurality offprismslS- that are affixed to the'end of the i hollow'shaf-tfarthest"from the light source.

Each''of the prisms l18 isso disposed with respect toa plurality of hollow arms 2.0 that' extendl'a'tright Vanglesto'the axis of the shaft-Y l'thatl light ,from the ysource 5 ,is :reflected from the'said prisms througha pluralityof lenses21-carried` bythe hollow. "armsV and '23, which of a piorf variations'inl the picture "or message.

picture to be transmitted, assuch picture is constrained to assume such cylindrical form in its passage over a shielding device 22 under the control ofthe traveling cords. Y.

As the cords constituting the conveyor pass the shielding device, they are held closely adjacent thereto by a pluralityof small Yrollers are (more clearly illustrated in Fig. 4. i v v Theshielding device is provided with an opening (not shown) through which the light passes to fall upon the picture. l

Each of the hollow extensions carrying the concentrating lenses 21 is provided with a coaxial parabolic mirror 24, the focus ofV which is coincident Vwith the point inthe plane of thefpaper at which-'the light' from the source is focused. v.In addition, eachjof the saidextensions passes through a mirror 25 disposed at anangle of 45""tothe ax1sv'of the hollow shaft, 'which/mirror'gathers thelight from the parabolic mirror and reflects it toward the photocell mounted' in thek housing 2L The housing'for the scanning device is'.y preferably provided with an eye,p1ece'26,

the innerend of which'carries a-'groundglassV 27 Yof a Vsimilar screen, on which the Vlight from the source may bevfocused for, observa-lV tionpurposes during transmission.

Inthe operation of thefapparatus shown in Figs. l, 2 and 3, a pluralityoffseparate typewritten messages, or a'y plurality of'photographs orl similar objects are fed, oneat a time, between [the cylindrical shield 22,]and' the traveling cord-conveyonff and are ycaused-- to slowly move in a directionparallel tothe axis of the hollow shaft 1 3.' The" rate of velocity of the hollow shaft are' so adjusted that the message moves forward f just suiiciently during a single rotation ofl the lsaid,l l u shaft that the light from the source traces a yThe construction of the scanning device.

series of p'arallel lines thereover. The rewith, is representative, at each instant, of

The manner in which'y the'output current from theJ photocell is utilizedto controla radio transmitter or a wired radio transmiti'A ter is familiar to those skilled in the art forms no part of the, present invention.`

At the receiving stat1ona scanning'device,

similar tothat used; for transmitting, isut;y

lizedfor` the reception of the messages on a continuous strip of photo-sensitive'material that is caused to advance by a cord-conveyn,v or byl any appropriate means, through the p the incoming signal.:

Vhereinbefore described in connection with the transmitter are shown in Fig. 5.

The means for providing a rotating beam of light comprises a driven shaft 30 to one end of which is affixed a hollow T-sliape extension 3l. A plurality of mirrors disposed at 450 to the axis of the shaft, or a plurality of prisms 32, are mounted within the liollow extension.v Light from a glow tube 33 .is

" thrown upon the prisms, is reflected therefrom through a plurality `of lenses i 34, mounted in the arms of the extension 31, and is concentrated as a fine` point on the concave surface of the traveling photo-sensitive strip.

. The glow tube, or other appropriate light source, is connected to the output terminals of an amplifier (not shown) and the light therefrom isthus caused to vary in intensity proportionally to the incoming signal.` i

It will, accordingly.` bei` apparent that, as

the photo-sensitive strip is caused to assume a cylindrical shape `by reason of the small rollers 23 and the shielding device 22, the rotating T-shape extension carrying the lenses 34 traces a series of parallel lines across the said photo-sensitive surface. In-

` asmuch as the intensity of the light varies proportionally Vto the incoming signal, the

Vpicture will be received in the form of a plurality of fine lines, each ofl which varies throughout its length in accordance with the illumination furnished by the glow tube.

An extremely important modification of my invention is illustrated in Fig. 6. This modification is, in many respects,`the "same Y as the embodiment shown in Figs. 1, 2` and 3, with the exception that the lens-carrying extension 31 is disposed angularly with re.`

spect to the axis of the rotating shaft. When the modified form ofjtransmitter it utilized,

i ."the'speed of travel of the picture and the angular velocity of the shaft are so correlated that the lines of light traced by one lens system' are duplicated by the lines ofliglit H traced by the other lenssystem. The picture is, therefore, actually sentin duplicate and,

. ifproper means were provided at thereceiving station, two `separate and idistinctpic tures could be received.

I prefer,however, to provide, at the said receivin station a rintin Jr device somewhat similar to that shown inkFig. `5, but having the arms of the T-shape extension staggered as shown in Fig. 6, whereby the photo-sensi tive strip may be caused to advance at suoli` speed with respect `to theangular velocity ofthe shaft thattheflightfmodulations, oc-

casioned by the successive scanning ofthesame picture or message element at the transi mitter, are superimposed.

' `It will thus be apparentthat, if static or other atmospheric disturbance causes the `Jbliteration of signals representative of one thereof missing. i

It also lies within the scopei of `my inven-` tiontouprovide more" than two offset scanning, `lenssysteins attheftransmitter and to similarlylprovide more tliantwo offset scanning lens systems .at the receiver, The `provision ofthree such systems at the transmitter and receiver, however, "seems to give sufficient freedom from interference. i

Although I have chosen certain specific embodiments of my invention for purpose of illustration, it is not to be restricted thereto, inasmuch as many modifications thereof will be apparent to those skilled in the facsimiletransmission art. My invention, therefore, is not to be lilnited, except in so far as is necessitated by the prior art or by the spirit of the appended claims.

I claim as my invention:

1`. In a facsimile-transmitting-receiving ill not he iiiafried,l and the picture, when in proximity of said moving surface as to` trace a plurality of paths thereon transverse to the direction of movement thereof, certain of said paths overlying each other.

2. In a facsimile-transmitting-receiving system, means for moving a light-receiving surface, and means for causing a plurality of rays of light to so rotate in proximity to said ice moving surface as to trace af pluralityof i .pathsthereom said light rays being angularly disposed with respect to their axes of rota-l tion and so spaced apart fromeach other in the direction ofsaid axes, andthe speed of movement of said surface being so correlated with the angular velocity of said rays, that each element of said surface is tracedby more than one of said rays.

to rotate about a common axis, and means for said rays.`

4. In combination, a source of light means for deriving from saidsource a plurality ofl `light-rays that diverge at differing `angles from a reference axis, means for causing said rays to rotate about said axis, and means for causing a light-receiving surface to so move in adirection parallel to said axis as to be cyclically subiecteu tothe action of said rays.

3.` In combination, a source of light, means `for deriving two diverging light rays from sai-d source, means for causing said light rays ies" rie

5. In "a facsimile-transmitting-receiving system, means for moving a light-receiving surface, means for causing a plurality of an gularly separated rays oflight to so rotate in y proXimity't-o said' moving surface as to trace a l plurality of paths thereon transverse to the y direction of movement thereof, and a plurality of rotating reflecting devices, one foreach lightray,1for gathering light reflected from said surface and directing it along the axis of rotation of said rays. Y Y 1` 6. The combination 'called for by claim 5 Whereinthe reflectingy devices are eachroonstituted by a parabolic mirror and a plane mirror. fl *l V.In testimony whereof, I have hereunto sub,-

scribed my naine thislth day of May, 1929,

y VLADIMIR K. ZWORYKIN. 

